fix: use truthy check for intermission filter, add route test

`is True` strict identity fails if the NHL API returns an integer 1
instead of a JSON boolean. A truthy check is safe here since the
Intermission field is always False/0 for non-intermission live games.

Also adds a test that verifies intermission games are separated from
live games in the /scoreboard response.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/routes.py

@@ -48,7 +48,14 @@ def get_scoreboard():
         games = parse_games(scoreboard_data)
         return jsonify(
             {
-                "live_games": [g for g in games if g["Game State"] == "LIVE"],
+                "live_games": [
+                    g
+                    for g in games
+                    if g["Game State"] == "LIVE" and not g["Intermission"]
+                ],
+                "intermission_games": [
+                    g for g in games if g["Game State"] == "LIVE" and g["Intermission"]
+                ],
                 "pre_games": [g for g in games if g["Game State"] == "PRE"],
                 "final_games": [g for g in games if g["Game State"] == "FINAL"],
             }